Multi-objective optimization of crashworthiness of energy-absorbing box for vehicle front longitudinal beam

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (3) : 212-217.

XU Zhongming, WANG Qingqing, FAN Weichun, ZHANG Zhifei

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Abstract

The distribution form of inducing grooves on energy-absorbing box has a great influence on vehicle collision performance. Here, taking energy-absorbing box structure of vehicle front longitudinal beam as the study object, the simulation model of vehicle frontal collision was established, and the multi-objective optimization design was performed for the crashworthiness of the energy-absorbing box structure. Taking spacing between inducting grooves on the box as the design variable, after sample points were collected using Hammersley method, the maximum energy absorption E of the box, the maximum rigid wall reaction force F and the maximum car body acceleration a were taken as objective functions. Kriging method and the radial basis method were used to construct the approximate surrogate model for each objective function, and accuracies of these models were tested. The multi-objective optimization was performed for these models with the second-generation non-inferior sorting genetic algorithm-II(NSGA-II). The results showed that compared with the original model, the non-uniform distribution form of inducing grooves on the box after optimization obviously improves the box’s crashworthiness; the deformation compression mode is more sufficient and orderly.

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vehicle / crashworthiness / energy-absorbing box / inducing grooves / multi-objective optimization

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XU Zhongming, WANG Qingqing, FAN Weichun, ZHANG Zhifei. Multi-objective optimization of crashworthiness of energy-absorbing box for vehicle front longitudinal beam[J]. Journal of Vibration and Shock, 2021, 40(3): 212-217

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